Koleyn (Persian: كلين)[a] is a village in, and the capital of, Koleyn Rural District of Fashapuyeh District of Ray County, Tehran province, Iran.

[4] At the time of the 2006 National Census, the village's population was 480 in 130 households.

[5] The following census in 2011 counted 534 people in 158 households.

[6] The 2016 census measured the population of the village as 433 people in 126 households.

This Ray County location article is a stub.